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It is generally known that tangential force characteristics of wheel/ rail have a great influence on the vehicle dynamics characteristic. However, according to one author’s previous researches, it is difficult to estimate tangential force characteristics of actual-wheel/rail interface correctly, because the shape of contact patch of actual-wheel/ rail may not be a complete ellipse shape due to existence of fine unevenness on wheel tread. This paper presents the results of the laboratory experiments carried out in relation to tangential force coefficient between contacting two cylindrical test specimens under different surface conditions, and the numerical analysis results of hunting stability of railway vehicle with the fine unevenness on wheel tread. In the laboratory experiments, the tangential force coefficient of specimens with/without a variety of fine unevenness under different attack-angles has been obtained by means of a two-disk rolling contact machine. The experimental results showed, in the case of attack-angle is zero, the longitudinal tangential force coefficient becomes smaller when the fine unevenness is larger than the case without fine unevenness. On the other hand, in the case of the attack-angle is about 0.2deg, the lateral tangential force coefficient is small when the interval of the fine unevenness is large. Furthermore, a numerical analysis was carried out to estimate the relationship between a variety of fine unevenness and the hunting stability of railway vehicles. As a result of this study, it is clarified that the fine unevenness on wheel tread has an improvement effect on the hunting stability of railway vehicle.

Influence of the Fine Unevenness of Wheel Tread on the Running Stability of Railway Vehicle